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clocksource/drivers/nios2: Convert init function to return error 

The init functions do not return any error. They behave as the following:

  - panic, thus leading to a kernel crash while another timer may work and
       make the system boot up correctly

  or

  - print an error and let the caller unaware if the state of the system

Change that by converting the init functions to return an error conforming
to the CLOCKSOURCE_OF_RET prototype.

Proper error handling (rollback, errno value) will be changed later case
by case, thus this change just return back an error or success in the init
function.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Daniel Lezcano 2016-06-07 00:04:02 +02:00
parent 2712616fed
commit dd1364a743
1 changed files with 45 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
arch/nios2/kernel/time.c
View File

@ -206,15 +206,21 @@ irqreturn_t timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
static void __init nios2_timer_get_base_and_freq(struct device_node *np,
static int __init nios2_timer_get_base_and_freq(struct device_node *np,
void __iomem **base, u32 *freq)
{
*base = of_iomap(np, 0);
if (!*base)
panic("Unable to map reg for %s\n", np->name);
if (!*base) {
pr_crit("Unable to map reg for %s\n", np->name);
return -ENXIO;
}
if (of_property_read_u32(np, "clock-frequency", freq))
panic("Unable to get %s clock frequency\n", np->name);
if (of_property_read_u32(np, "clock-frequency", freq)) {
pr_crit("Unable to get %s clock frequency\n", np->name);
return -EINVAL;
}
return 0;
}
static struct nios2_clockevent_dev nios2_ce = {
@ -231,17 +237,21 @@ static struct nios2_clockevent_dev nios2_ce = {
},
};
static __init void nios2_clockevent_init(struct device_node *timer)
static __init int nios2_clockevent_init(struct device_node *timer)
{
void __iomem *iobase;
u32 freq;
int irq;
int irq, ret;
nios2_timer_get_base_and_freq(timer, &iobase, &freq);
ret = nios2_timer_get_base_and_freq(timer, &iobase, &freq);
if (ret)
return ret;
irq = irq_of_parse_and_map(timer, 0);
if (!irq)
panic("Unable to parse timer irq\n");
if (!irq) {
pr_crit("Unable to parse timer irq\n");
return -EINVAL;
}
nios2_ce.timer.base = iobase;
nios2_ce.timer.freq = freq;
@ -253,25 +263,35 @@ static __init void nios2_clockevent_init(struct device_node *timer)
/* clear pending interrupt */
timer_writew(&nios2_ce.timer, 0, ALTERA_TIMER_STATUS_REG);
if (request_irq(irq, timer_interrupt, IRQF_TIMER, timer->name,
&nios2_ce.ced))
panic("Unable to setup timer irq\n");
ret = request_irq(irq, timer_interrupt, IRQF_TIMER, timer->name,
&nios2_ce.ced);
if (ret) {
pr_crit("Unable to setup timer irq\n");
return ret;
}
clockevents_config_and_register(&nios2_ce.ced, freq, 1, ULONG_MAX);
return 0;
}
static __init void nios2_clocksource_init(struct device_node *timer)
static __init int nios2_clocksource_init(struct device_node *timer)
{
unsigned int ctrl;
void __iomem *iobase;
u32 freq;
int ret;
nios2_timer_get_base_and_freq(timer, &iobase, &freq);
ret = nios2_timer_get_base_and_freq(timer, &iobase, &freq);
if (ret)
return ret;
nios2_cs.timer.base = iobase;
nios2_cs.timer.freq = freq;
clocksource_register_hz(&nios2_cs.cs, freq);
ret = clocksource_register_hz(&nios2_cs.cs, freq);
if (ret)
return ret;
timer_writew(&nios2_cs.timer, USHRT_MAX, ALTERA_TIMER_PERIODL_REG);
timer_writew(&nios2_cs.timer, USHRT_MAX, ALTERA_TIMER_PERIODH_REG);
@ -282,6 +302,8 @@ static __init void nios2_clocksource_init(struct device_node *timer)
/* Calibrate the delay loop directly */
lpj_fine = freq / HZ;
return 0;
}
/*
@ -289,22 +311,25 @@ static __init void nios2_clocksource_init(struct device_node *timer)
* more instances, the second one gets used as clocksource and all
* others are unused.
*/
static void __init nios2_time_init(struct device_node *timer)
static int __init nios2_time_init(struct device_node *timer)
{
static int num_called;
int ret;
switch (num_called) {
case 0:
nios2_clockevent_init(timer);
ret = nios2_clockevent_init(timer);
break;
case 1:
nios2_clocksource_init(timer);
ret = nios2_clocksource_init(timer);
break;
default:
break;
}
num_called++;
return ret;
}
void read_persistent_clock(struct timespec *ts)
@ -327,4 +352,4 @@ void __init time_init(void)
clocksource_probe();
}
CLOCKSOURCE_OF_DECLARE(nios2_timer, ALTR_TIMER_COMPATIBLE, nios2_time_init);
CLOCKSOURCE_OF_DECLARE_RET(nios2_timer, ALTR_TIMER_COMPATIBLE, nios2_time_init);